package com.geotmt.billingcenter.config.threadpool;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.task.TaskExecutor;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ThreadPoolExecutor;

/**
 * @Description 线程池配置
 * @Author      yanghanwei
 * @Mail        yanghanwei@geotmt.com
 * @Date        2019/4/10 18:01
 * @Version     v1
 **/
@Configuration
@EnableAsync
public class ThreadPoolConfig {

    @Value("${thread.corePoolSize}")
    private int corePoolSize;

    @Value("${thread.maxPoolSize}")
    private int maxPoolSize;

    @Value("${thread.queueCapacity}")
    private int queueCapacity;

    @Value("${thread.keepAliveSeconds}")
    private int keepAliveSeconds;

    @Value("${thread.threadNamePrefix}")
    private String threadNamePrefix;

    @Bean
    public TaskExecutor taskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        // 设置核心线程数
        executor.setCorePoolSize(corePoolSize);
        // 设置最大线程数
        executor.setMaxPoolSize(maxPoolSize);
        // 设置队列容量
        executor.setQueueCapacity(queueCapacity);
        // 设置线程活跃时间（秒）
        executor.setKeepAliveSeconds(keepAliveSeconds);
        // 设置默认线程名称
        executor.setThreadNamePrefix(threadNamePrefix);
        // 设置拒绝策略rejection-policy：当pool已经达到max size的时候，如何处理新任务 CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 等待所有任务结束后再关闭线程池
        executor.setWaitForTasksToCompleteOnShutdown(true);
        return executor;
    }
}
